Cant reference passed value attribute in returned html code

I'm sure I'm doing something dumb but I don't see why this code wont work. It's react code that I'm compiling with webpack:

  var markers = this.state.assets;
      assets = assets.map(function(asseti,index){
        return(
          asseti.map(function(asset, index){
            return(
              <Marker position=[{asset.location.coordinates[0]},{asset.location.coordinates[1]}]>
                <Popup>
                  <span>A pretty CSS3 popup.<br/>Easily customizable.</span>
                </Popup>
              </Marker>

            )
          })
        )
      });

I get the error

JSX value should be either an expression or a quoted JSX text

  90 |           asseti.map(function(asset, index){
  91 |             return(
> 92 |               <Marker position=[{asset.location.coordinates[0]},{asset.location.coordinates[1]}]>
     |                                ^
  93 |                 <Popup>
  94 |                   <span>A pretty CSS3 popup.<br/>Easily customizable.</span>
  95 |                 </Popup>

Thanks, Ed.

via Ed Lynch