Hiking on Terceira: the official trails, Mistérios Negros, and which walk to choose

Terceira has fourteen short trails in the official Azores register, plus one long route across the west of the island. Before you pick one, decide two things: how high you want to go, and whether you can get back to your car. The interior trails climb to 500 to 700 metres, where cloud settles even on days when the coast is clear. Three of the shorter routes are linear and end several kilometres from where they start.

Below, the trails are grouped by terrain, with the most space for Mistérios Negros, the hardest short walk on the island, and the practical side: closures, mud, gates and getting to the start.

Every official trail has its own page on trails.visitazores.com, with distance, time, grade, a map and a GPS track you can download. When we checked on 1 October 2026, the Serreta circuit (PRC03TER) in the north-west was marked "closed trail" on its official page, and no reason was given. The other thirteen short trails had no such notice.

Closures are marked on those pages, so look at yours again on the morning you walk.

None of the Terceira trail pages listed a fee or a booking requirement when we checked in October 2026.

These walks cross the high centre of the island, inside the Terceira Nature Park, through native heather, juniper and laurel. All of them need a car, because no bus goes up to the plateau.

A 5.2 km circuit, graded hard, average time 2 hours 30 minutes. It starts by Lagoa do Negro, next to the building that serves the Gruta do Natal lava tube. The route winds through the Mistérios Negros, a field of black trachyte domes thrown up in the eruption of 1761, now a nature reserve in the Serra de Santa Bárbara.

The distance is short. The hard grade comes from the ground: a narrow path between the domes, dense scrub on both sides, and peat underfoot that stays wet and muddy. The path passes three small ponds, the Lagoinhas do Vale Fundo, of which only one holds water all year. There is an optional detour up Pico Gaspar, and a survey pillar on Pico da Cancela. The route stays between roughly 540 and 650 metres, so fog can roll in fast.

Gruta do Natal is 697 metres of lava tube at the trailhead. If its opening hours fit, you can visit before or after the walk. Our guide to Algar do Carvão and Gruta do Natal has the cave details.

A 4 km circuit inside the Caldeira de Guilherme Moniz, graded medium, 2 hours 30 minutes. The time sounds long for the distance, and the reason is the terrain: the official page describes it as rocky and irregular. What you come for is the cart ruts. Ox carts carried wood out of the crater for centuries and wore grooves into the lava, and you can still follow them. A viewpoint looks over the Cinco Picos caldera, about 7 km across.

An 8.7 km circuit, graded medium, 2 hours 30 minutes, reaching about 700 metres at Rocha do Chambre itself. The views are over the Pico Alto crater and the Vale do Azinhal. The official page says to walk it on a day of good weather and visibility, and it means it: in cloud you see nothing. You pass through working farmland, so close every gate behind you.

A 6.4 km circuit, graded easy, 2 hours 30 minutes, starting near the Altares reservoirs. It climbs through cedar and high pasture to a wetland with a birdwatching hide, and a viewpoint at about 650 metres looks over the whole north of the island. Even so, the official page warns about slippery surfaces and asks for a clear day.

A 6.2 km circuit, medium, linking the lava chimney of Algar do Carvão and the steaming ground of Furnas do Enxofre. The caves guide linked above covers it with the cave visit.

The gentlest of the forest walks: 6.6 km, easy, about 2 hours, from the São Brás picnic area. It passes the nursery where the island's native plants are grown, a monument to the ox cart, a fountain and the Pulho do Salto waterfall. The highest point is under 300 metres, so it is the one to choose when the cloud is down on the hills.

A 7.7 km circuit, medium, about 2 hours 30 minutes, from an old mill in Agualva. It follows the stream up past mill races and orchard terraces into the woods. The parish once ran nearly fifty water mills.

An easy coastal walk of 3.9 km, about 2 hours, from Canada da Alagoa to Quatro Ribeiras on the north shore. It drops to the Alagoa da Fajãzinha, a silted-up bay closed off by a pebble beach, then runs past small bays under cliffs of columnar basalt. There are sea cliffs along the way; keep to the path.

An easy 5.9 km walk, about 2 hours 30 minutes, on the south-east coast. It passes a string of coastal forts, three of them dated 1581, and the Contendas lighthouse, and ends at the main square of São Sebastião.

Three of the short trails end somewhere other than where they start: Baías da Agualva (PR02TER), Fortes de São Sebastião (PR05TER) and Malha Grande - Biscoitos (PR09TER). For these you need a second car, a taxi booked for a set time, or the patience to walk back the way you came.

Malha Grande - Biscoitos is the longest of the three: 14.4 km, graded medium, about 3 hours 30 minutes, from Rocha do Chambre in the interior down to the bathing pools at Biscoitos. It goes over a survey point at 704 metres and past the Gruta dos Balcões, then down through the Biscoitos vineyards, and it crosses a regional road near Baía das Pombas, where you need to watch for traffic. Leave the car at Biscoitos and take a taxi to the start in the morning; then you finish at the pools, not at an empty car park in the hills.

Our guide to getting around Terceira explains why a hire car is close to essential for the interior, and how taxis work.

• Clear day, fit walkers: Mistérios Negros, then Rocha do Chambre if you still have legs.
• Clear day, easy pace: Lagoa do Cerro.
• Cloud on the hills: Relheiras de São Brás, Baías da Agualva or the forts.
• With the caves: Mistérios Negros starts at Gruta do Natal, and PRC10TER starts at Algar do Carvão.
• From Angra without a car: Monte Brasil (PRC04TER) starts on the edge of town. Our Angra guide describes it.

Wear waterproof boots or trail shoes with good grip: the official pages warn of mud and slippery ground on the high trails. Pack a rain jacket even in summer, and carry your own water and food. Download the GPS track from the official page before you set off so you have the route offline. In an emergency, call 112.

How many official trails does Terceira have? Fourteen short trails (PR and PRC codes) and one long route, the Grande Rota do Oeste, as listed on trails.visitazores.com in October 2026. Serreta (PRC03TER) was marked closed at that time.

What is the hardest short walk on Terceira? Mistérios Negros (PRC01TER): 5.2 km, graded hard, about 2 hours 30 minutes, over narrow, wet ground between lava domes from the 1761 eruption.

Can I hike on Terceira without a car? Monte Brasil starts in Angra, and the coastal and forest walks can be reached by taxi. The interior trails have no bus, so for those you need a car, a taxi or a tour.

Do I have to pay to walk the trails on Terceira? No fee or booking was listed on any Terceira trail page when we checked in October 2026. Rules change, so check the trail's official page before you go.