The following may be a spoiler, but there is one location which contains a high amount of rotten flesh.
If you travel east from the pine forest trader, you'll come to a crossroads. Turn south in the small town past the pawn shop, then east again and follow the dirt road. Once you hit the next larger street, turn north and you will find Carl's Corn and Bob's Boars. This area has a lot of decaying corpses around, as well as other loot.
This area also contains a secret area, with more corpses. The high amount of dead bodies could be an indicator as to what you may expect there.
Keep in mind that the game resets a location if you activate a quest related to that location (e.g. a fetch quest, etc.), which allows you to loot the location again before the reset timer expired.