Dead Sea / deep / salty lake / world
Dead Sea is the deepest salty lake in the world
Great Barrier Reef / long / reef / world;
Great Barrier Reef is the longest reef in the world.
Grand Canyon / not / large / canyon / world
Grand Canyon is not the largest canyon in the world.
Blue Cave in Greece / large / Blue Grotto in Italy.
Blue Cave in Greece is larger than Blue Grotto in Italy.
Dead Sea / small/ Araruama Lagoon
Dead Sea is smaller than Araruama Lagoon.