After the moment of discovery, the expedition descended from the mountain range towards the sea, arriving in the lands of
cacique Chiapes, who was defeated after a brief battle and invited to join the expedition. From Chiapes' land, three groups departed in the search for routes to the coast. The group headed by Alonso Martín reached the shoreline two days later. They took a canoe for a short reconnaissance trip, thus becoming the first Europeans to navigate the Pacific Ocean off the coast of the New World. Back in Chiapes' domain, Martín informed Balboa, who, with 26 men, marched towards the coast. Once there, Balboa raised his hands, his sword in one and a standard with the image of the Virgin Mary in the other, walked knee-deep into the ocean, and claimed possession of the new sea and all adjoining lands in the name of the Spanish sovereigns. After traveling more than , Balboa named the bay where they ended up
San Miguel, because they arrived on September 29, the feast day of the
archangel Michael. He named the new sea
Mar del Sur, since they had traveled south to reach it. Balboa, now a more formal pirate with small boats, sailed expeditions to search for the gold-rich kingdoms promised by Panquiaco. To this end, he crossed through the lands of
caciques Cora and Tumaco, defeating them easily and taking their riches of gold and
pearls. He then learned that pearls were abundant in the islands ruled by Terarequí, a powerful and feared
cacique. Balboa set out in several canoes towards these islands, even though it was the beginning of October and the weather conditions were not favorable. He was barely able to make out the islands, and named the largest one
Isla Rica (Rich Island, today known as
Isla del Rey). He named the entire group
Archipiélago de las Perlas, which they are still called today. In November, Balboa decided to return to Santa María but by a different route to further expand his territory and procure more gold. He passed through the regions of Teoca, Pacra, Bugue Bugue, Bononaima, and Chorizo, defeating some by force and befriending others through diplomacy. A particularly bloody battle took place against the
cacique Tubanamá, whom Balboa eventually defeated. In December, the expedition arrived back in the Caribbean coast, by the
Gulf of San Blas, a strip of land ruled by
cacique Pocorosa. From there, he headed to the lands of Comogre, to find that his elderly ally had died. His son, Panquiaco, was now the chieftain. From there, he crossed the lands of Ponca and Careta, arriving in Santa María on January 19, 1514, with a treasure in cotton goods, more than 100,000
castellanos worth of gold, to say nothing of the pearls. All this did not compare to the magnitude of the discovery of the South Sea on behalf of Spain. Balboa commanded Pedro de Arbolancha to set sail for Spain with news of this discovery. He also sent one fifth of the treasure to the king, as the law required. ==Disputes with Pedro Arias==