Despite being a densely populated urban center, Colombo maintains several vital green lungs and wetland reserves.
- **Viharamahadevi Park**: Formerly Victoria Park, this is Colombo's oldest and largest public park, featuring a large Buddha statue, water features, and ancient trees. - **Diyatha Uyana**: Located on the banks of the Diyawanna Oya, featuring walking paths, an aquarium, and weekend plant markets. - **Beddagana Wetland Park**: An urban sanctuary designed to protect the local marshlands, offering boardwalks for birdwatching (look for endemic water birds and monitor lizards). - **Talangama Wetland**: A tranquil, scenic area on the city's outskirts, highly favored by nature photographers and ornithologists.