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Retencija Blato aka 'Ozero Ontario' is a large fishing lake between the Zagreb golf and country club and the A3 road.
The Retencija Blato ticklist is 216 species (see link below). There is an island/peninsula which is a popular bird roost Species seen include Common Rosefinch, European Serin, Wood Lark, Tree Sparrow, Greater Scaup, Avocet, Wryneck, European Bee-eater, Purple Heron, Ferruginous Duck, Pallid Harrier and Marsh Harrier. Note: As of 2022 the website says 'temporarily closed'. Unclear if this applies only to fishing, or all visitors.
South side of Zagreb adjoining A3 road. Click on a P in the map to get directions to a praking place.