Tourists admiring the cave during a boat trip on the crystal waters of Melissani Lake, Kefalonia, Ionian Islands, Greek Islands, Greece, Europe

photography vertical color image travel destinations travel large group of people people men adult women outdoors day greece europe melissani lake cave boat tourist kefalonia ionian islands greek islands rock formation rock tree nature clear sky cliff landscape lake water woman adults female females person travel destination tourist destination tourist destinations rock formations rocks outdoor outside man male males lakes pond ponds natural daytime caves boats nautical vessel nautical vessels transport transportation