The phrase "a massif of" is correct and usable in written English.
It can be used to describe a large mountain mass or a significant amount of something, often in a geological or metaphorical context.
Example: "The hikers were awestruck by the sheer size of the massif of granite that loomed before them."
Alternatives: "a mountain of" or "a range of".
The Hindu Kush, a massif of snow and ice, loomed 30 miles to the north; Kabul lay far below us, obscured behind a layer of dust and smoke that smudged the panorama like a dirty fingerprint.
The Troodos is a massif of eroded igneous rock dissected by steep valleys covered with stands of pine, cypress, dwarf oak, and cedar, now protected as state forests; its peaks are snow-clad from December to March.
The Garo Hills in the west rise abruptly from the Brahmaputra River valley to about 1,000 feet (300 metres) and then merge with the Khasi Hills and Jaintia Hills, adjacent highland systems that form a single massif of tablelands separated by a series of eastward-trending ridges.
The Monchique Mountains, a dissected massif of intrusive igneous rock (syenite), rise to 2,959 feet (902 metres) at Mount Foia.
The 3-D seismic tomographic data are used together with field, core and well log structural information to determine the detailed 3-D architecture of fault zones in a granitic massif of volume 500×575×168 m at Mina Ratones area in the Albalá Granitic Pluton.
He's also the inventor of JockUps, homemade jockstraps with gargantuan, stackable cups that can morph your middling mound into a mighty massif of mountainous manhood.
Yet for those motivated by results, every time Hughes went back to domestic cricket he built an irrefutable massif of runs and waited in its shade for the selectors to arrive.
After a short countdown, he leaned forward, said, "See you," and was soon banking and soaring over the dense forest and abrupt rock faces of a massif near the northern Italian town of Riva del Garda.
Wales's highest mountain is a starfish-shaped massif of almost-Alpine grandeur, haunted by legend and bygone industry, and populated with falcons, goats and rare beetles.
A massif (1,798 m) commanding the Lake of Lucerne.
Taiwan is characterized by the massif of a central mountain system with the highest peak of ca. 4000 m above sea level (ASL) and Tropic of Cancer crosses the southern part of the island.
