Negombo Lagoon: Mangroves, Stake Nets and Monkey Island

The Negombo lagoon is a shallow brackish body of about 35 square kilometres behind the town, fringed with mangrove and fed by the Dandugam Oya. It is one of the most productive fishing grounds in Sri Lanka and it has been worked the same way for centuries.

What makes it worth a couple of hours is that it is a working place. The channels are lined with stake nets — brush-pile traps and fixed nets set into the lagoon floor — and the boats you pass are catching prawns and crab rather than carrying visitors. The oruwa outrigger canoes still in use here are essentially unchanged in design for hundreds of years.

The mangroves themselves are the other half. The boat cuts into narrow channels where the canopy closes overhead, and the ecosystem is genuinely intact: mangrove roots holding the bank, crabs on the mud, and the nursery function that makes the whole fishery possible.

It is calm water throughout, which makes it suitable for children, non-swimmers and anyone who did not enjoy the sea.

The lagoon connects to the Dutch canal, built in the eighteenth century to move cinnamon down to Colombo, which is still navigable in parts.

Birds are the reliable part. Kingfishers — white-throated, common and stork-billed — are almost guaranteed along the channels. Egrets, herons, cormorants and, in the migratory season from about November to March, waders on the mudflats. Brahminy kites overhead.

Water monitors are common on the banks, some of them large, and they swim well. Mudskippers on the flats at low water.

Monkey Island is a small mangrove island in the lagoon with a resident troop of macaques, and most trips stop there. It is a genuine population rather than a feeding station, though visitors do feed them, which is the usual mistake — keep food packed away.

The fishing is the part people remember. Depending on the hour you will see stake nets being cleared, crab pots lifted, and prawn boats working. Guides on these trips are usually from the fishing families and can explain what is being caught and how, which turns a boat ride into something more useful.

Dolphins occasionally enter the lagoon mouth. Do not count on it.

Early morning is best: the birds are active, the light is good, the fishing is happening, and it is not yet hot. Late afternoon is the second choice and gives you sunset over the water.

Midday trips are the least rewarding — birds are quiet, the light is flat and the boat has no shade in most cases.

Two to three hours is the standard length. Half-day versions pair the lagoon with the dawn fish market, which is the best combination available in Negombo and gets you back for a late breakfast.

Bring sun protection above all: there is little or no shade on most boats and the water reflects. A hat, sunscreen and sunglasses are not optional.

Insect repellent for the mangrove channels, binoculars if you have them, and a bag you can keep closed around the macaques.

The boats are small and open. Life jackets should be provided; ask if they are not offered. The water is shallow and calm, but this is still a boat.

Immediately south of the lagoon is Muthurajawela, a coastal marsh of about 6,000 hectares and one of the most important wetlands in Sri Lanka. It holds around 200 bird species, plus otters, purple-faced langurs and a large crocodile population. Boat trips run from the southern end of the lagoon and are quieter than the Negombo lagoon trips.

The name means Supreme Field of Pearls, and there is a good story attached: the Portuguese cut a channel that let salt water in and destroyed what had been productive rice land, which is how a paddy district became a marsh.

Wilpattu National Park is about three hours north and is the other reason to be based on this coast. It is the largest national park in Sri Lanka, dominated by natural sand-rimmed lakes called villus, and it is far quieter than Yala — a fraction of the jeeps for the same leopards, at considerably lower odds of seeing one. A full day, and worth it for anyone who prefers the park to the sighting.

Bentota and the Madu River mangroves are two hours south, which makes a longer boat-and-turtle day possible from here.