| Date - Field | Vietnam - Terrain |
2008 January Terrain | low, flat delta in south and north; central highlands; hilly, mountainous in far north and northwest |
2007 January Terrain | low, flat delta in south and north; central highlands; hilly, mountainous in far north and northwest |
2006 January Terrain | low, flat delta in south and north; central highlands; hilly, mountainous in far north and northwest |
2005 January Terrain | low, flat delta in south and north; central highlands; hilly, mountainous in far north and northwest |
2004 January Terrain | low, flat delta in south and north; central highlands; hilly, mountainous in far north and northwest |
2003 January Terrain | low, flat delta in south and north; central highlands; hilly, mountainous in far north and northwest |
2002 January Terrain | low, flat delta in south and north; central highlands; hilly, mountainous in far north and northwest |
2001 January Terrain | low, flat delta in south and north; central highlands; hilly, mountainous in far north and northwest |
2000 January Terrain | low, flat delta in south and north; central highlands; hilly, mountainous in far north and northwest |