Flores Island rises from the Atlantic as the westernmost point of the Azores archipelago, a 143-square-kilometre basalt plateau carved by erosion into ravines so deep that twenty waterfalls cascade directly into the ocean along its northern and western shores. The island's volcanic geology, formed by repeated eruptions between 700,000 and 3,000 years ago, created a coastline of near-vertical cliffs, sea caves accessible only by water, and offshore islets that serve as nesting grounds for Cory's shearwaters and Bulwer's petrels. Portuguese settlers arrived in 1452, establishing Santa Cruz das Flores as the administrative centre, but the island's isolation—five hours by ferry from Faial, three by air from São Miguel—meant that until the late twentieth century, most coastal features remained unnamed and unvisited. Flores boat tours Azores expeditions launch from Porto das Poças, a sheltered harbour in Santa Cruz where the island's first whaling boats were moored in the 1800s. Modern marine excursions navigate the same waters that early inhabitants avoided, threading through grottoes where Atlantic swells have hollowed out chambers fifteen metres high and columns of basalt rise like organ pipes from the seafloor. The northern route passes beneath Rocha dos Bordões, a cliff formation of vertical prismatic columns that geologists compare to Iceland's Svartifoss, while the western route follows the coastline to Fajã Grande, where Ribeira Grande waterfall drops 90 metres into tidal pools below. Corvo Island, 17 kilometres northwest, is Europe's smallest autonomous island—6.2 square kilometres supporting 384 residents—and reachable only by boat when conditions allow. The archipelago's marine protected areas, designated in 2011, restrict motorised access to zones outside seabird colonies, but permit guided transit along corridors where bottlenose dolphins and short-finned pilot whales feed year-round. Flores boat tours operate within these corridors, using vessels with hydrophones to detect cetacean vocalisations at distances up to three kilometres. The island's microclimate, shaped by the Gulf Stream and orographic lift, produces rain on 240 days annually, sustaining the waterfalls that define the western cliffs but also limiting safe navigation windows to mornings and early afternoons when wind speeds stay below fifteen knots. Tour operators monitor real-time swell data from the Horta meteorological station before departure.