above-water abstract appearance armor armored armorment armour armoured armourment brown carapace Designs foliage freshwater lake lake-turtles leathery light limb log markings partially-submerged patterns plants reflections reptile reptilian resting shape shaped shell small texture textured turtles water wet beach castle Causeway coastline Cornish cornwall England english flooded fort Great Britain inundated island mainland Marazion Michael mount national trust ocean route saint sea shore St. Michael's Mount stones stronghold submerged tourism tourists above water Ears eye head herbivore herbivorous hide hippo hippopotamus hippopotamus amphibius mammal nostrils observant observing pool reflection ripples rippling river horse semi-submerged shadows shiny skin sunlight sunshine surface hippopotami battlements clouds sand security sky towers