"Apt" geographical element needed to complete the answers to 10 of this puzzle's clues

Question:

Length:

Similar Crossword Questions:

"Dog the Bounty Hunter" network, and a hint to the theme in this puzzle's four longest answers
"Inner voice" hidden in five puzzle answers
"Field" hidden in five puzzle answers
Word needed to be added to 12 appropriately placed answers in this puzzle for their clues to make sense
Ocean "crossing" this puzzle's four longest answers (abbr.)
Source of money that's "spread" in nine puzzle answers
Meal that's "skipped" in four puzzle answers
"The wart stops here" product, and a hint to the theme found in eight puzzle answers
"Figure head" found in this puzzle's longest answers
Quayle, who can be "hunted" down in four answers of this puzzle
"Home work" letters that appear at both ends of this puzzle's theme answers
Word "split" in this puzzle's eight longest answers
"Central" Ireland found in four puzzle answers
Stone that's "cut" in this puzzle's four longest answers
African antelope "caged" in five answers in this puzzle
Debra Messing character, whose name goes "around" four answers in this puzzle
Spell "bound" by this puzzle's four longest answers
Business "meeting" hidden in nine puzzle answers
Records "broken" in this puzzle's nine theme answers
HBO's "Inside the __" (and hidden theme in this puzzle's four longest answers)
Grate, with "get," or what this puzzle's theme answers get
"Dough" found in this puzzle's four longest answers
Letters for the names "buried" in this puzzle's theme answers
1969 Cream hit ... or a hint to the seven "mathematical" clues in this puzzle
"We're on to you!" (and a hint to how this puzzle's other four longest answers were created)