Mexico
Volcanic ridges rise offshore from La Ventana above reefs shaped by Gulf currents.
From the beach at La Ventana the island is a long volcanic silhouette across the channel. Under the surface, its reefs and rock walls hold the current's traffic: jacks, rays and whatever the season sends past.
Isla Cerralvo, officially renamed Isla Jacques Cousteau, rises offshore from La Ventana and El Sargento, its surrounding reefs worked by local boat operators for diving, snorkelling and seasonal wildlife watching. The island itself has no visitor facilities, so everything for the day crosses in the boat. Hammerheads, mantas and whales pass on their own calendar, never on demand.
Friends
Boat out under a local operator and dive the current-swept reefs together.
Solo
Base in La Ventana and take the island's water on its own seasonal terms.
La Ventana's operators pack the day's lunch into the boat; the island has no visitor facilities of its own.
Meals bracket the crossing on the mainland shore, where the launch beaches are.

Corryvreckan
Scotland
One of Earth's largest whirlpools churns between two islands, its roar carrying across open sea.

Central Island
Kenya
Three volcanic crater lakes in three different colours on an island ruled by Nile crocodiles.

St Kilda
Scotland
Britain's most remote islands, evacuated in 1930, where a million seabirds outnumber the ghosts.

Orange River (Vioolsdrif)
South Africa
A green river corridor carries rafts between bare Richtersveld mountains.

Pico de Orizaba
Mexico
Mexico's highest mountain rises from forest routes to a serious high-altitude summit.

Nevado de Toluca
Mexico
Cold crater paths circle two high lakes beneath Mexico's shifting mountain weather.

Cañón del Pegüis
Mexico
The Río Conchos cuts striped desert rock into a remote Chihuahua gorge.

Basaseachi Falls
Mexico
Seasonal water plunges into a pine-lined canyon in Chihuahua's Sierra Madre.