(Srimad-Bhagavatam First Canto, Chapter 3, text 24)
Here's the account from the "Ramayana" of Sage Valmiki about the construction of Ram Sethu bridge 30 kilometers long :
"At Rama's command, those lions among the monkeys entered the mighty forest with alacrity in hundreds and thousands on every side and those leaders on the simian tribes, tearing up the rocks, which in size they resembled, and the trees also dragged them to the sea and they covered the ocean with Sala, Ashvararna, (list of tree names).Those foremost monkeys transported those trees, with or without roots, bearing them like so many standards of Indra (the king of heaven) and they heaped (list of tree names) here and there. With the aid of mechanical devices, those powerful colossi dug up stones as big as elephants and rocks, and the water suddenly spouted into the air only to fall instantly. Thereafter those monkeys churned up the sea by rushing into it on all sides pulling on the chains.
"That immense causeway constructed by Nala in the bosom of the sea was built by the arms of those monkeys of formidable exploits and it extended over a hundred leagues.
"Some brought trunks of trees and others set them up; it was by hundreds and thousands that those monkeys, like unto giants, made use of reeds, logs and blossoming trees to construct that bridge, rushing hither and thither with blocks of stone resembling mountains or the peaks of crags, which, flung into the sea, fell with a resounding crash.
"The first day those monkeys resembling elephants, or immense energy, full of high spirits and exceedingly merry, erected fourteen leagues of masonry. The second day, those highly active monkeys of formidable stature set up twenty leagues. Bestirring themselves, those giants threw twenty-one leagues of structure over the ocean on the third day and on the fourth, working feverishly, they built up twenty-two leagues in extent. The fifth day, those monkeys, industrious workers, reached to twenty-three leagues distance from the further shore.
"That fortunate and valiant son of Vishvakarma (architect of the demigods), leader of the monkeys, constructed a causeway worthy of his sire over the ocean and that bridge erected by Nala over the sea, the haunt of whales, dazzling in its perfection and splendor, was like the constellation of Svati in space.
"Then the gods, Gandharvas, Siddhas (living beings superior to humans) and supreme Rishis (great sages) assembled in the sky, eager to see that masterpiece, and the gods and Gandharvas gazed on that causeway, so difficult of construction, that was ten leagues in width and a hundred in length built by Nala.
"Those monkeys thereafter dived, swam and shouted at the sight of that unimaginable marvel that was almost inconceivable and caused one to tremble! And all beings beheld that causeway thrown over the ocean and by hundreds and thousands of kotis (millions), those monkeys, full of valor, having built that bridge over the immense repository of waters, reached the opposite shore.
"Vast, well-constructed, magnificent with its wonderful paved floor, solidly cemented, that great causeway like unto a line traced on the waves, resembled the parting of a woman's hair.
Here's the account from the "Ramayana" of Sage Valmiki about the construction of Ram Sethu bridge 30 kilometers long :
"At Rama's command, those lions among the monkeys entered the mighty forest with alacrity in hundreds and thousands on every side and those leaders on the simian tribes, tearing up the rocks, which in size they resembled, and the trees also dragged them to the sea and they covered the ocean with Sala, Ashvararna, (list of tree names).Those foremost monkeys transported those trees, with or without roots, bearing them like so many standards of Indra (the king of heaven) and they heaped (list of tree names) here and there. With the aid of mechanical devices, those powerful colossi dug up stones as big as elephants and rocks, and the water suddenly spouted into the air only to fall instantly. Thereafter those monkeys churned up the sea by rushing into it on all sides pulling on the chains.
"That immense causeway constructed by Nala in the bosom of the sea was built by the arms of those monkeys of formidable exploits and it extended over a hundred leagues.
"Some brought trunks of trees and others set them up; it was by hundreds and thousands that those monkeys, like unto giants, made use of reeds, logs and blossoming trees to construct that bridge, rushing hither and thither with blocks of stone resembling mountains or the peaks of crags, which, flung into the sea, fell with a resounding crash.
"The first day those monkeys resembling elephants, or immense energy, full of high spirits and exceedingly merry, erected fourteen leagues of masonry. The second day, those highly active monkeys of formidable stature set up twenty leagues. Bestirring themselves, those giants threw twenty-one leagues of structure over the ocean on the third day and on the fourth, working feverishly, they built up twenty-two leagues in extent. The fifth day, those monkeys, industrious workers, reached to twenty-three leagues distance from the further shore.
"That fortunate and valiant son of Vishvakarma (architect of the demigods), leader of the monkeys, constructed a causeway worthy of his sire over the ocean and that bridge erected by Nala over the sea, the haunt of whales, dazzling in its perfection and splendor, was like the constellation of Svati in space.
"Then the gods, Gandharvas, Siddhas (living beings superior to humans) and supreme Rishis (great sages) assembled in the sky, eager to see that masterpiece, and the gods and Gandharvas gazed on that causeway, so difficult of construction, that was ten leagues in width and a hundred in length built by Nala.
"Those monkeys thereafter dived, swam and shouted at the sight of that unimaginable marvel that was almost inconceivable and caused one to tremble! And all beings beheld that causeway thrown over the ocean and by hundreds and thousands of kotis (millions), those monkeys, full of valor, having built that bridge over the immense repository of waters, reached the opposite shore.
"Vast, well-constructed, magnificent with its wonderful paved floor, solidly cemented, that great causeway like unto a line traced on the waves, resembled the parting of a woman's hair.