I suppose that places like Varanasi would meet the letter of your description (i.e. "burning of human corpses in the open" and "a place where there are always burnings and corpses and mourning").
I haven't been there -- this English newspaper article (with photographs) says, I don't know how truthfully
But the atmosphere at the giant funeral site is not one of sorrow, as mourners instead laugh, chat and play cards as the funeral preparations are carried out.
The closest male relative must perform the funeral rites, while women are traditionally not allowed to be present for fear they will cry and ruin the respectful atmosphere.
But my image of a "charnel ground" would be of abandoned, unburnt, decaying corpses; not a lot of human presence; and maybe carrion-eaters -- like a graveyard except where corpses are not buried nor cremated.
Wikipedia: Charnel ground says
Throughout Ancient India and Medieval India, charnel grounds in the form of open air crematoria were historically often located along rivers and many ancient famous charnel sites are now 'sanitized' pilgrimage sites (Sanskrit: tirtha) and areas of significant domestic income through cultural tourism. However, proper "charnel grounds" can still be found in India, especially near large rivers banks and areas where abandoned people (without family) are cremated or simply left to decompose.
... and cites suttas
'Cemetery contemplations', as described in Mahasatipatthana Sutta (DN: 22) and the Satipaṭṭhāna Sutta (MN: 10):
...have as their objects a corpse one or two or three days old, swollen up, blue-black in colour, full of corruption; a corpse eaten by crows, etc.; a framework of bones; flesh hanging from it, bespattered with blood, held together by the sinews; without flesh and blood, but still held together by the sinews; bones scattered in all direction; bleached and resembling shells; heaped together after the lapse of years; weathered and crumbled to dust.
At the end of each of these contemplations there follows the conclusion: "This body of mine also has this nature, has this destiny, cannot escape it."
Similar are the 10 objects of loathsomeness (asubha q.v.).