Semau Island lies about 25 minutes by boat from Kupang's harbour, separated from the main island by a narrow strait. It is dramatically less developed than the mainland — savannahs, lontar palms, white-sand beaches, and a small population of fishing families. The surrounding waters are clear enough for snorkelling, and the coral is in decent condition on the sheltered western side.
Most visitors come on day trips from Kupang. Boats depart from the ferry terminal and the crossing is straightforward in calm weather, though the strait can be choppy during the northwest monsoon (November to March). There are no hotels; a few local families can arrange simple accommodation and meals for those who want to stay overnight. Bring water and food supplies from Kupang.