The whole island covers some 3 km2 and is the only reserve owned by OTOP. The number of aquatic warblers on the island depends on the water level and the available vegetation. There were between 55 singing males in the late 1990s.
The island's size (3 km²) is a key factor in its management by OTOP. The number of aquatic warblers on the island is influenced by water levels and vegetation, which are also crucial factors for their survival.  In the late 1990s, there were approximately 55 singing males.