Asia big crocodile dangerous salt water boat nature salt water sea tourism beach beach cams beach guards breakwater cold depth foam fog gulls horizon lasting natural Netherlands ocean powerful shipping strong sturdy summer terneuzen wave weathered westerschelde wet winter wood zeeland bow wave deep harbour waves backdrop background lake texture plant plants seaweed sveres air brine concentrating house clean drops fresh graduation house gush health health care healthy Mineral minerals pure ripple salina salt works sike structure thorn house trickle Africa bird bush bushes egipt low-tide mangrove paddle seacost shrub trees wade water bird estuarine estuary fresh-water light reflecting reflection salinity salt-water shade shadows shrubbery shrubs sunlight sunshine tidal tide vegetation water-quality animal aquarium aquatic dolphin fishy flipper h2o mammal porpoise reef saltwater salty sea life underwater