From the in game Help MAP EDITING HELP+HOT KEYS file
'Asterix' - This allows the map editor to input a new height to a hex. it is best used right after placing the hex. Use to adjust a hexagon's height slightly when desired
press * then enter -1 and it will report as being a ford
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"You are never to old to rock and roll if you are too young to die".--- What do you expect to be doing when you are 80?