Tanintharyi Region

Tanintharyi is Myanmar's southernmost administrative region, a long narrow coastal strip running south from the Mon State border to the Thai frontier at Kawthaung. To the west, the Andaman Sea; to the east, forested ranges connecting to the Thai peninsula. The defining feature is scale: the Myeik Archipelago alone contains over 800 islands, and most remain without regular visitors or infrastructure. The Andaman Sea produces one of Southeast Asia's largest tidal ranges — spring tides at 4.0 to 5.0 m in the northern part of the region, dropping somewhat as you move south toward Kawthaung. The regime is semidiurnal. On exposed shores this range reshapes the coastline dramatically between high and low water: beaches that vanish at springs reappear as broad sand flats at low, and intertidal reef platforms that dive sites reference are only accessible on the ebb. The coast faces restrictions for foreign visitors at various points — permits and licensed liveaboard operators are the practical route to the outer islands. The Moken sea nomads, who have inhabited the outer archipelago for centuries, maintain traditional boat-dwelling communities on several islands; cultural protocols around visits apply. The mainland towns — Myeik, Dawei, Kawthaung — are functional Burmese port towns, each with a fishing fleet and market. Dawei has a government-promoted deep-sea port development project. Kawthaung sits directly opposite Ranong, Thailand, connected by longtail boat. Predictions come from Open-Meteo Marine (gridded model, ±45 min / ±0.2–0.3 m).