Where did the disciples fish?

Assuming your talking about the "fishers of men" story in Matthew 4:18-19 it says "As Jesus was walking beside the Sea of Galilee, he saw two brothers, Simon called Peter and his brother Andrew. They were casting a net into the lake, for they were fishermen. "Come, follow me," Jesus said, "and I will make you fishers of men" So the answer to your question would be the Sea of Galilee.