Batam refers to both an island, municipality (an Indonesian
kotamadya), the largest city in the
Riau Islands Province of
Indonesia, across the
Strait of Singapore, the third-largest city in
Sumatra region after
Medan and
Palembang, and the eighth-largest city in Indonesia after
Jakarta Raya,
Surabaya,
Bandung, Medan,
Semarang,
Makassar, and Palembang.