Ourph said:
I wouldn't say there is "a lot". 3e D&D certainly doesn't ignore the possibility of random encounters, but it also doesn't assume the use of random encounters the way that OD&D, B/X D&D or AD&D did. There's a significant difference between the amount of space spent discussing and facilitating the use of random encounters in AD&D and the space spent covering the same subject in 3e.
It's funny - AD&D leaves out the description of how to check for random encounter in a dungeon. BD&D has "every 2 turns, there's a 1 in 6 chance of a random encounter", but it's not in AD&D. Drove me mad looking for it.
Picking up the AD&D DMG, we find the following:
page 47 & 49: the description of determining outdoor encounters
page 174-179 - dungeon random encounters
page 179-180 - underwater random encounters
page 181-182 - ethereal & psionic random encounters
page 182-189 - outdoor random encounters (including random castles... love that table)
page 190-190 - waterborne/airborne random encounters
page 191-193 - city encounters
Picking up the D&D 3E DMG, we find the following:
page 79-81 - dungeon encounter tables
page 87 - sample forest encounter table
page 88 - sample temperate marsh encounter table
page 89 - sample temperate hills encounter table
page 90 - mountains encounters
page 91 - desert encounters
page 92 - plains encounters
page 95 - the description of determining outdoor encounters
page 96-98 - tables for stocking outdoor encounters
page 102 - urban encounters
However, you can find expanded tables are in the supplements:
Forgotten Realms DM Screen
- 32 page booklet, 31 pages of which are random encounter tables. The other is the title page.
Frostburn
page 199-224 - random encounter tables for cold terrain (forest, hills, marsh, mountain, plains, aquatic, outsider)
Sandstorm
page 220-224 - random encounter tables for desert/waste terrain
Stormwrack
page 212-221 - random encounter tables for aquatic encounters (cold, temperate & warm, marine, lake & rivers, plus "lowerdark", "middledark" and "upperdark" - encounters in the Underdark!)
Cheers!