[Ballbarian]

Change the value in the following line to change terrain from swamp to something else:
#terrain 8 131106 - Swamp, Large

#land sets the active province & kills everybody there. It has no effect on terrain.

#setland sets the active province without killing anybody.


Try the following:

-- 
-- Map file for Dominions 3
-- 
-- Illwinter Game Design
-- www.illwinter.com
-- 

-- Title and image file
#dom2title Battle Simulation Map
#imagefile BattleSim_v3.tga
#domversion 175
#defaultmapzoom 0.8
#description "This map is only 10 provinces. It speeds up testing by making it easy to reach locations. Or it can work for a very fast two-player battle."

-- Province names/terrains
#terrain 1 4227592  - Border Mountains, Fresh Water, No Start
#terrain 2 2052  - Sea, Deep Sea
#terrain 3 2  - Plains (default terrain), Large
#terrain 4 4194816  - Border Mountains, No Start
#terrain 5 577  - Waste, Small, No Start
#terrain 6 258  - Farmlands, Large
#terrain 7 4608  - Cave, No Start
#terrain 8 2  - Plains (default terrain), Large
#terrain 9 641  - Forest, Small, No Start
#terrain 10 4194944  - Border Mountains, Forest, No Start

#landname 1 "Walden Pond"
#landname 2 "the Deep Blue Sea"
#landname 3 "Main Lyonthe Plains"
#landname 4 "Rockina HardPlace"
#landname 5 "Watta Waste"
#landname 6 "Marvin Gardens"
#landname 7 "Deep Praved"
#landname 8 "Bog of Eternal Stench"
#landname 9 "Yew Are Here"
#landname 10 "Knot Here"

-- Province neighbours
#neighbour 1 3
#neighbour 2 3
#neighbour 2 5
#neighbour 2 6
#neighbour 3 8
#neighbour 4 8
#neighbour 4 10
#neighbour 4 7
#neighbour 5 9
#neighbour 5 6
#neighbour 6 8
#neighbour 6 9
#neighbour 8 10

--

#specstart 38 4 - MA Caelum starts in P4
#specstart 30 10 - MA Man starts in P10

#setland 4
#commander 629 - Create Stalker commander in P4 for Caelum and equip with items. All of the lines in this section work
#additem "(item name here)"
#additem "(item name here)"
#additem "(item name here)"
#additem "(item name here)"
#additem "(item name here)"
#additem "(item name here)"
#additem "(item name here)"

#land 8 - It's my understanding that these three lines should set ownership of P8 to Man with a PD of 20, but they don't do either
#owner 30
#defence 20