| CONTOURMAP | A map marked with contour lines (7,3) |
| RELIEFMAP | Chart that depicts land configuration, usually with contour lines (6,3) |
| STEVENSON | 19th-century Scottish author whose adventure novel Treasure Island popularised the idea of a pirate's map marked with an X (9) |
| ISOHYETS | Contour lines connecting points of equal rainfall on a map (8) |
| RELIEF | What map contour lines show is a comfort (6) |
| ISOTHERM | From the Greek meaning "equal heat", a contour line on a weather map joining places with the same temperature (8) |
| ISOTHERE | In meteorology, a contour line on a weather map connecting points with equal mean summer temperature (8) |
| ELEVATION | Word used to describe the height above sea level determined by contour lines on a topographic map (9) |
| ISOPACH | In geology, a contour line on a map connecting points of equal stratigraphic thickness (7) |
| ISOBATH | A contour line on a map or nautical chart connecting points of equal underwater depth (7) |
| ISOGRAM | A word, such as "ambidextrously", with no repeating letters; or, a contour line connecting points registering the same value of some quantity (7) |
| ISOHELS | Contour lines connecting points of equal amounts of daily sunshine (7) |
| ISOBATHS | Contour lines connecting points of equal underwater depth (8) |
| ISOCHEIM | A contour line of mean winter temperature (8) |
| ISALLOBAR | The contour line on a weather chart (9) |
| ISOHEL | A contour line of equal amounts of sunshine (6) |
| HILLS | Cycled up, scrambled over, hiked or rambled, features of the natural landscape that are shown on maps by means of contour lines (5) |
| LAYERS | Rock strata; different coloured spaces between contour lines on topographic maps; hens kept for their eggs; or, clothes worn under others (6) |
| PRODUCTION | Making a contour dip unpredictably (10) |
| ISOCRYME | Contour line of equal temperature during the coldest period of a year (8) |
