Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
List of lakes of Finland
Table title:
Ten largest lakes
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > rank </th><th colspan=1 rowspan=1 > name </th><th colspan=1 rowspan=1 > area (km²) </th></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Suur-Saimaa (1) </td><td colspan=1 rowspan=1 > 4,400 </td></tr>
<tr> <td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > Saimaa </td><td colspan=1 rowspan=1 > 1,377.05 </td></tr>
<tr> <td colspan=1 rowspan=1 > 2 </td><td colspan=1 rowspan=1 > Päijänne </td><td colspan=1 rowspan=1 > 1,080.63 </td></tr>
<tr> <td colspan=1 rowspan=1 > 3 </td><td colspan=1 rowspan=1 > Inari </td><td colspan=1 rowspan=1 > 1,040.28 </td></tr>
<tr> <td colspan=1 rowspan=1 > 4 </td><td colspan=1 rowspan=1 > Pielinen </td><td colspan=1 rowspan=1 > 894.21 </td></tr>
<tr> <td colspan=1 rowspan=1 > 5 </td><td colspan=1 rowspan=1 > Oulujärvi </td><td colspan=1 rowspan=1 > 887.09 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 6 </td><td class="highlighted"  colspan=1 rowspan=1 > Pihlajavesi </td><td class="highlighted"  colspan=1 rowspan=1 > 712.59 </td></tr>
<tr> <td colspan=1 rowspan=1 > 7 </td><td colspan=1 rowspan=1 > Orivesi </td><td colspan=1 rowspan=1 > 601.30 </td></tr>
<tr> <td colspan=1 rowspan=1 > 8 </td><td colspan=1 rowspan=1 > Haukivesi </td><td colspan=1 rowspan=1 > 562.31 </td></tr>
<tr> <td colspan=1 rowspan=1 > 9 </td><td colspan=1 rowspan=1 > Keitele </td><td colspan=1 rowspan=1 > 493.59 </td></tr>
<tr> <td colspan=1 rowspan=1 > 10 </td><td colspan=1 rowspan=1 > Kallavesi </td><td colspan=1 rowspan=1 > 472.76 </td></tr>
</table>
Question:
How large is the area of the Pihlajavesi lake?
Answer:
The area of the Pihlajavesi lake is 712.59 square kilometres and making it the sixth.