What is it in the oceans currents that make some areas better for seashells?

The Philippines is a shell collector’s paradise. Three of the 13 most valuable shells in the world come from this country. The publication Shells and the Philippines states: “By far the most fabulous for the diversity of its shell-bearing animals is the Indo-Pacific, a vast reach of water extending from the Red Sea and the eastern coast of Africa across the Indian Ocean, and into the Pacific beyond Hawaii and Easter Island. . . . But the center of this vast region and a mecca for shell collectors, is the Philippine Archipelago, with its thousands of islands, reefs, channels, bays, seas, and record offshore deeps.