Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Mission name | Lunar lander | Lunar landing date | Lunar blastoff date | Lunar landing site | Duration on lunar surface | Crew | Number of s EVA | Total EVA Time (HH:MM) |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Apollo 11 | Eagle | 20 July 1969 | 21 July 1969 | Sea of Tranquility | 21:31 | Neil Armstrong , Edwin "Buzz" Aldrin | 1.0 | 2:31 |
| Apollo 12 | Intrepid | 19 November 1969 | 21 November 1969 | Ocean of Storms | 1-day, 7:31 | Charles "Pete" Conrad , Alan Bean | 2.0 | 7:45 |
| Apollo 14 | Antares | 5 February 1971 | 6 February 1971 | Fra Mauro | 1-day, 9:30 | Alan B. Shepard , Edgar Mitchell | 2.0 | 9:21 |
| Apollo 15 | Falcon | 30 July 1971 | 3 August 1971 | Hadley Rille | 2 days, 18:55 | David Scott , James Irwin | 3.0 | 18:33 |
| Apollo 16 | Orion | 21 April 1972 | 24 April 1972 | Descartes Highlands | 2 days, 23:02 | John Young , Charles Duke | 3.0 | 20:14 |
| Apollo 17 | Challenger | 11 December 1972 | 14 December 1972 | Taurus-Littrow | 3 days, 2:59 | Eugene Cernan , Harrison H. "Jack" Schmitt | 3.0 | 22:04 |
Question:
Where was the landing site when the duration on the lunar surface was 21:31?
Answer:
Sea of Tranquility