What is now Daan Lungsod was the original site of Oslob. Before that, the place was known as bolocboloc because in its seashore is a natural spring. It was a favorite waterhole of both natives and travellers alike for its fresh waters were cooled by the huge branches of a nigad tree. It was under this nigad tree that the legend of how the name of Oslob came about.
Oral tradition relates.
Groups of Spanish colonizers went around the province to familiarize themselves with native settlements. One of them came to Bolocboloc and saw a couple who were eating under the nigad tree. They were dipping their cooked bananas into a bowl of salt. Wanting to know about the name of the place, they asked the two natives in Spanish. The Castilian took it as the name of the place.