FOSS gamedev and creative worlds

How turn off islands on mapgen 7? I want generate a single continent with lakes and rives

Use custom noiseparams (as explained in minetest.conf) to raise average terrain level so that seas become smaller lakes.
Add these to .conf but increase the first number:

The first number is the average terrain level for the 2 terrain types, increase them by the same amount, perhaps start by increasing by 16 then tune to taste.
Then increase mountain height:

Increase the first number by the chosen amount.

Thanks, does there are full manual about others parameters of mapgen 7?

Not yet, but lua_api.txt has some explanation of noise parameters, although it's rather technical.

After raise average terrain level (on the advice of paramat) decreased number of lakes. Does there a way to increase number of lakes after raise average terrain level on a smooth landscape?

You can split the lakes up into a larger number of smaller lakes by increasing octaves from 5 to 6 and/or increasing persistence from 0.6 to 0.7. However this will make the smooth landscape less smooth.