Points on the map, where borders of 4 countries meet - how many of these are there in the world? is there a point with 5 countries?

The diagram below shows the positions of earth, sun, and moon during two types of tides. the difference between high tide and low tide a. is same during tide 1 and tide 2 b. is very less during tide 1 and tide 2 c. is greater during tide 2 than during tide 1 d. is greater during tide 1 than during tide 2