Ilheu das Rolas

Off Sao Tome's southern tip, Ilheu das Rolas sits precisely where schoolbooks promise: the equator crosses the islet, and the marble marker on its ridge - reached by a sweaty, satisfying path - lets visitors stand with a foot in each hemisphere while the mosaic map underfoot confirms the geography. The rest of the day earns the boat fare on its own: reef coves for snorkelling, the abandoned roca's ruins dissolving into palms, fishing families' villages along the shore, and views back across the strait to the big island's green wall. Resort facilities and simple local arrangements coexist; both versions end at the same sunset.

What you actually see

• The equator marker - two hemispheres, one photograph.
• The reef coves - snorkelling the islet's clear corners.
• The roca ruins - plantation memory going back to green.
• The strait views - Sao Tome's peaks across the water.

When to go

June to September for calm crossings and dry paths; morning boats give the fullest day and the glassiest snorkelling. The marker photo queue - such as it is - peaks midday.

Honest expectations

The crossing is short but open - lifejackets worth requesting; the marker path is hot and slick in flip-flops. Day-trip logistics run smoothest arranged the evening before at Porto Alegre. It is a charming, modest day - the equator does the headline work.

Nearby

Porto Alegre, Praia Jale's turtle beach and the southern roca coast.