Three rivers flow out to sea at Bhitarkanika forming a tidal maze of muddy creeks and mangroves. Most of this 672-sq-km delta forms Bhitarkanika Wildlife Sanctuary (272460; permit Indian/foreigner per day Rs 20/1000). A significant ecosystem, it contains 63 of the world’s 75 mangrove varieties. Hundreds of estuarine crocodiles, some 6m-plus monsters, bask on mud flats waiting for the next meal to swim by. Dangmar Island contains a successful breeding and conservation programme for these crocodiles. Less dangerous creatures are pythons, water monitors, wild boar and timid deer. The best time to visit is from December to February.