Japan was called Aniloddhita during Ramayana era

In Valmiki Ramayana, Sugreeva orders Vanara leader Vinata to go towards east direction and search for Seetha.
Vinata is allowed to take 100,000 vanaras with him in this search operation.
Japan in Ramayana was Aniloddhita

The reference point for directions specified by Sugreeva is not Kishkinda, but center of Vindhya mountains, which is near Nagpur today.
Sugreeva asks Vinata to first search towards North-East where rivers like Ganga, Yamuna, Sarayu, Kaushiki (koshi), Shona (shon), Mahii, Kalamahi, Sindhu and Saraswati begin their journey.
He also asks him to search in kingdoms of Brahma-maala, Videha, Maalva, Kaashi, Kosala, Maagadha, Pundra, Anga. These kingdoms are from present Himalayas till north-east where Brahmaputra river flows.
River Shona is present day Shon, and Kaushiki is Koshi, and she is the sister of Vishvamitra. That sage explains about the emergence of this river in Bala Kanda.
He did not even want to spare Seetha’s birth place mithila (Videha) and expected Ravana might have hidden her somewhere other than Lanka.
Sugreeva also describes about half-man half-tiger like man-eating tribals (those who wear tiger masks and hunt humans), few with iron-faces (masks) and rapid moment on single-foot (hopping on long sticks).
He also talks about islanders who eat raw fish and to reach there Vanaras will need boats. These must be deltas in Brahmaputra river.
He talks about golden complexion tribe who wear long hats or towering wisps (Myanmar, Laos, Cambodia, Vietnam).
Here, तीक्ष्ण चूडाः च हेमाभाः प्रिय दर्शनाः (4-40-27) means people with towering wisps, wearing golden crowns or complexion and pleasant faces.
They are Khmer people in East Asia.
Cambodia Apsara Crown in Ramayana

मागधाम् च महाग्रामान् पुण्ड्रान् अंगाम् तथैव च |
भूमिम् च कोशकाराणाम् भूमिम् च रजत आकराम् || ४-४०-२३

Translation : From Magadha, through Pundra and Anga enter the land of Koshakaara, which is literally a silkworm or one who makes scabbards or a lexicographer.
Sugreeva describes the land where Silk is worn and Silver is mined. This is present day Myanmar (Burma) where Myanmar silk is real hand made and even in neighbouring countries like Thailand, silk is worn.
Burma (Myanmar) Silk in Ramayana
Fake history was created that Silk originated in China during 4th millenium BCE and did not travel outside until ‘Silk Road’ opened in 1st millenium BCE.
Lotus Silk is a variety, which does not involve silkworm and is called a non-violent silk. This originated in Burma (Myanmar).
Burma (Myanmar) Lotus Silk in Ramayana
Later he describes 7 kingdoms which have gold and silver mines like Yava (Java), Sumatra, Bali, Indonesia etc.
Yava became Java, and simha puri ‘lion-city‘ became the present day Singapore.

यत्नवन्तो यव द्वीपम् सप्त राज्य उपशोभितम् |
सुवर्ण रूप्यकम् द्वीपम् सुवर्ण आकर मण्डितम् || ४-४०-३०

Translation : You strive hard in the island of Yava, which will be splendorous with seven kingdoms, like that even in Golden and Silver islands that are enwreathed with gold-mines, in and around Yava islands.
He called the land between Myanmar (Burma) till Malaysia as Suvarna Rupyakam Dweepam. Even today countries between Myanmar-Malaysia are called Suvarnabhumi.
Bangkok airport is named as SuvarnaBhumi International Airport.
Here, the mountains described are in Thailand.
Suvarnabhumi Airport Sagara Manthan Panoramic View

After searching in Plaksha and Ikshu islands, which are Indonesia and Malaysia, Sugreeva asks them to go towards an Island where sea waves dash the shores violently.

ततः समुद्र द्वीपान् च सुभीमान् द्रष्टुम् अर्हथ |
ऊर्मिमंतम् महारौद्रम् क्रोशंतम् अनिल उद्धितम् || ४-४०-३६

Translation : It will be apt of you to proceed from there and see the terribly furious, tempestuous, blaring, and tide-ripped ocean called ikshu samudra, and that ocean’s islands which will be extremely ghastly.

Here, Anila Uddhitam or Aniloddhita is description of present day Japan, where ‘Anil’ means wind and ‘Uddhita’ means impudent.
The Island where wind is always impudent and strong waves hit the coasts is Japan.
Even today Japan faces fierce storms from all sides.
Japan Tides and Typhoon in Ramayana
Sugreeva then orders them to down towards Australia and then to New Zealand and thereafter towards South America.

On the way towards Australia and New Zealand, the Ring of Fire (Demon Hayagreeva) was described which had a Map in the shape of Horse Face.
ring of fire pacific ocean

In ancient Japan, India was called as ‘Tenjiku‘, which means ‘Center of Heaven‘.
Through Chinese, the Japanese got to know of the Western Paradise from which the Buddha emerged, Tianzhu (chinese name of Tenjiku).