Many of these islands were formed by the Pasig River delta and consist of sand and mudflats.
Historically, the City of Manila consisted of small islands formed by rivulets called esteros.
The walled district of Intramuros was itself an island surrounded by moats during the Spanish colonial period.
Near the entrance to Manila Bay is a group of islands, the largest of which is Corregidor.
City of Manila Malabon - Navotas Las Piñas - Parañaque