Five quick questions. Don't know something? Pick "I'm not sure" and we'll use typical values.
Sao Tome and Principe · Sea port · salt water · 1.5–37 m
Typical soil: sand, silt · indicative
Choose a known port, river, canal or lake — or describe your own location.
Opened from the map — depth 1.5–37 m and soil (sand, silt) are prefilled in the next steps. You can still change them.