Dive-site story
Onderwater Natuurpark Zegersloot is a dedicated freshwater dive zone located in the Zegersplas at Alphen aan den Rijn. The site features an underwater obstacle course connected by guide ropes, leading divers past sunken objects, small boat wrecks, training platforms, and artificial fish habitats. Water clarity tends to improve outside the warmest summer months when algae blooms diminish, making navigational lights and compass skills essential.
Submerged trail linking multiple small boat hulls and training platforms
Frequent encounters with large northern pike stalking near artificial structures
Purpose-built entry jetty facilitating shore access
Location
Use the map to plan with your operator and confirm the exact entry point on the day.
Seasonality
Spring and autumn provide the best balance between bearable water temperatures and reduced algae growth.
Marine life
| Species | Likelihood | J | F | M | A | M | J | J | A | S | O | N | D |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Northern pikeEsox lucius | Common | ||||||||||||
| European perchPerca fluviatilis | Common | ||||||||||||
| European eelAnguilla anguilla | Seasonal | ||||||||||||
| Common carpCyprinus carpio | Seasonal |
Marine forecast
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