After a march of some from San Diego and about from Velicatá, they had reached the bay they were seeking. But they failed to discern the coastline's semi-circular shape, described by Vizcaíno as round like an "O", even though members of the party had twice marched along its beach. Having failed to find their goal, they marched on north and reached the area at the north end of the bay, where Crespí named a creek Santa Cruz on October 18. Pushing on, they reached a creek in the present day town of Pacifica on October 31. On November 4, having crossed the low coastal mountain range above the creek, the party was stunned to catch a glimpse of the enormous San Francisco Bay from the mountain range, as the bay was previously unknown to the Spanish. This sighting was crucial to the later settlement of California because unlike Monterey Bay, it was surrounded by land on all sides except the Golden Gate, and thus it was not exposed to rough ocean currents as was the Monterey Bay, which had been known to the Spanish since Cabrillo's exploration in the sixteenth century. Despite the earlier explorations of Cabrillo and Vizcaíno, and despite two centuries of Spanish sailing the Pacific for trade between Asia and Mexico, the San Francisco Bay had been missed because of the fog that frequently shrouded its entrance. If the San Francisco Bay had been discovered earlier, the region surrounding would have been settled by the Spanish earlier since it would have provided a safe, convenient harbor for Spain's Pacific maritime trade.