set_avoid_player_start_areas with land_percent

<PLAYER_SETUP>
random_placement
<LAND_GENERATION>
base_terrain SNOW
create_player_lands
{
  terrain_type DEEP_WATER
  base_size 10
  number_of_tiles 0
  other_zone_avoidance_distance 7
  set_zone_randomly
  start_random
    percent_chance 50
      top_border                      6
      bottom_border                   6
      left_border                     12
      right_border                    12
    percent_chance 50
      top_border                      12
      bottom_border                   12
      left_border                     6
      right_border                    6
  end_random
}

<TERRAIN_GENERATION>

create_terrain SNOW {
  base_terrain DEEP_WATER
  land_percent 99
  number_of_clumps 99
  set_avoid_player_start_areas
}