The Three Great Beasts, Behemoth (Land), Leviathan (Sea), and Ziz (Sky).
In Greek Mythology, Zeus got land and sky, Poseidon got the ocean, and Hades drew the short straw for the Underworld.
Also, there are the primordial gods Gaia (the earth), Uranus (the sky), and Pontus (the sea). Gaia, the first and born out of Chaos, conceived Uranus and Pontus via parthenogenesis, and then mated with them. Most notably, the Titans and Greek pantheon were the byproduct of her union with Uranus. Additionally, Tartarus (the hell-pit) was sometimes perceived as a primordial deity/force of nature.
In Julian May's continuity of the Black Trillium series, there are three Archwizards: of the land, sea, and sky. Binah, the only non-evil sorceress in the original book, is retconned as the Archmage of the Land.
In the end of Quenta Silmarillion, all three of the eponymous Silmarils are distributed equally across the sky (Earendil's Silmaril), earth (Maedhros'), and sea (Maglor's).
Three of the Four Guardians of Neo Arcadia in Mega Man Zero fit this mold. Each functions as the military general of their own unit: SageHarpuia commands the Rekku Army (the air force), FairyLeviathan is leader of the Meikai Army (the navy), and Fighting Fefnir controls the Jin'en Army (the army). This is off-set partially by the fourth Guardian (Hidden Phantom) and his Zan'ei Army, which was Neo Arcadia's stealth force and anti-Resistance intelligence unit.
Pokémon: Groudon (land), Kyogre (sea), and Rayquaza (sky), all of which were based on the before-mentioned Three Great Beasts.
Resident Evil 5: the Earth, Sea, and Sky Emblems used to open a gate in one level.
The naming convention Sora (sky), Riku (land), and Kairi (sea) along with Ventus (sky), Terra (land), and Aqua (sea) in Kingdom Hearts.
Mitsumete Knight R: Daibouken Hen has the Slates of Earth, Sea and Sky. Scattered throughout the world, you need to gather them and put them all in a machine inside the Pyramid in order to activate the Warp Whistle system.
Used in one of the riddles in Batman: Arkham City. Although the wording suggests the classic military interpretation the actual answer is a shipping company.
In the Baten Kaitos series, the three objects used to seal Malpercio are the Earth Sphere, the Ocean Mirror and the Sword of the Heavens, when the sealing is shown in the 2nd game the line " Marno Ar Hello, Insert Name Here, accursed one, for the sake of the earth, the sky and the ocean, thy life must end!" is used. Of note is that during the games until the ending, the earth "polluted and barren", the ocean is sealed away ("and the Lost Ocean") and the lower part of the sky filled with the poisonous "taintclouds".
Five hats means that five tropers think it is ready to publish.
You are saying that you think this draft is ready to be published. That means the description is not ambiguous,
it doesn't duplicate an existing trope, there are at least three examples, and the title makes sense.
Is that what you meant to do?
You are saying this draft has a ready-to-publish hat it does not deserve and you are taking it back.