Here is an embark some may like, it is close to what I was searching for but without a river.

Steep faced Volcano and mountains (Terrifying Biome) meeting a flat forested area (Joyous Wilds) has potential for fun play whether you like to delve inside or build outside. It is rich with ores including iron and gold and has 3k of the blue metal. It has flux marble and plenty of Obsidian to play with.

For more info, including embark location read here.
http://www.bay12forums.com/smf/index.php?topic=101280.585