This is waka's unforgettable resting place for Tibetan traders and caravans of camels; Zi Geng Zhalantong. Zhalantong means black Rock beach in Tibetan language. These two rocks resemble two lions sitting on plates and reclining. They are the logistics center of rest, trade and transshipment for merchants in Sichuan, Yunnan and Tibet in ancient times. The town of Waka is not high and the climate is mild, so traders who arrive at Black Rock dump their wares from afar and set up tents and camps, often for ten days and a half months at a time. When the commodity trade was completed, the merchants divided into two ways to Tibet. One way they lined up a long caravan of horses and camels to the north through Derong Batang to Tibet, and the other way they took a boat at the Waka ferry under the Black Rock diamond to cross the river and entered Tibet through Deqin Mankham. With the passing of time, Waka town became a trade distribution center and an important post station on the yunnan-Tibet tea horse ancient Road.