36704 square meters (just a hair under a half sim - and about 1/4 of the rest of the sim is linden owned water!)
8400 prims
In the old mainland sim Hotei.
SLURL: http://slurl.com/secondlife/Hotei/125/188/28
This beach front land includes the mouth of a linden-owned river with an ISLAND in the center (island included in this property). The linden river opens up into a linden owned sea!
Land is for sale by owner.
Price: 7.5 L$/sqm. (275000L$)
How often do you get to own the mouth of a linden owned river, much less with a large island in the center? Not often! Less desirable land easily goes for 10L$/sqm. Grab it while it lasts!