Question: What is the name of the 350m high hill and Gustav Arthur Graser and his brother Karl Graser co-founded a social reform settlement?
Sentence (from "Pha Chor"): Geologists believed that a hundred or a thousand years ago this area was a part of the Ping River by observing pebbles and stones that were distributed in this area until the Ping River changed its flow direction to another path and that made this area lift to high hill.
Relevant evidence: No