The unique position of agarwood from Giao Chi / Champa (ancient Vietnam) on the global trade map.

Throughout the history of ancient and medieval trade, agarwood from the land that is now Vietnam—encompassing regions such as Giao Chi, Nhat Nam, and, most notably, the Kingdom of Champa—was recognized as the finest in the world, occupying a unique, irreplaceable position.

This distinction is evidenced by both Eastern and Western historical records, based on the following key factors:

1. Geographical distribution and the designation "Kingdom of Agarwood"

While regions such as Southern India, Sumatra, and Borneo also produced agarwood, the central coastal strip of Vietnam—the territory of the ancient Kingdom of Champa, stretching from Quang Binh to Binh Thuan, with a particular concentration in Khanh Hoa and Phu Yen—was hailed as the "capital" for the highest-quality agarwood-producing trees.

Champa—The Land of Agarwood: Westerners in ancient times referred to this region as Ciampa or Champa. In the accounts of the Italian traveler Marco Polo (13th century) and those of Portuguese and Persian merchants, Champa was consistently cited as the source of the most prized agarwood, home to the largest natural agarwood forests.

Rigorous classification: Ancient Chinese texts (such as the *Book of Sui* and the *Book of Tang*), as well as later Vietnamese geographical treatises, clearly distinguished agarwood from Giao Chi and Champa: it was noted for its pure, delicate fragrance, exceptional longevity, and the highest probability of yielding *Ky Nam* (a rare, ultra-premium, and exceedingly expensive variety of agarwood). 2. A Strategic Commodity in East Asian Diplomacy and Trade

In ancient times, Vietnamese agarwood was far more than a mere commodity; it served as a diplomatic tool and a strategic asset that helped shape the regional economic structure:

Tribute and Barter with China: From the period of Northern domination (in the regions of Jiaozhi and Rinan) through the eras of Vietnam’s independent dynasties (the Ly, Tran, and Le) and the Kingdom of Champa, agarwood was an essential and highly prized tribute offered to the Chinese emperors. The aristocracy of the Tang, Song, and Ming dynasties held such a fervent passion for Vietnamese agarwood that they were willing to exchange vast quantities of gold, silver, and silk to acquire it.

Supplies for Japanese Imperial Rituals: Agarwood from Champa reached Japan, carried by Buddhist monks and merchants. The world’s largest piece of agarwood, known as *Ranjatai*, has been held by the Shosoin (the Japanese Imperial Repository) since the 8th century. Modern scientific analysis has confirmed that it originated from the forests of Indochina—specifically, the ancient Kingdom of Champa. Regarded as a national treasure, it was so exclusive that only the most powerful Shoguns or Emperors in Japanese history were permitted to carve off a small fragment for their own use.

3. A Vital Hub on the "Maritime Silk Road"

The geopolitical position of Vietnam’s coastal strip served as a beacon and an indispensable stopover along international maritime trade routes. Bustling Port Towns: Ancient trading ports such as Kauthara (Nha Trang), Hoi An (Lam Ap Pho), and those in the Giao Chi region served as havens where merchant vessels from India, Arabia, and Persia would drop anchor to seek shelter from storms and replenish their provisions.

A Lucrative Commodity for Arab Merchants: After acquiring agarwood in Champa, West Asian merchants would either resell it in China at exorbitant prices or transport it back to the Mediterranean, where it was used in Christian and Islamic rituals. In this way, Vietnamese agarwood acted as a catalyst, connecting two distant corners of the world.

4. Exceptional Medicinal and Spiritual Value

Agarwood from this region holds a unique, unrivaled status, owing to the distinct soil composition and climate of the central coastal strip—characterized by intense heat, heavy rainfall, and a landscape where mountains rise directly from the sea. The *Aquilaria* trees (*cây dó bầu*) here produce an essential oil with a complex chemical structure, yielding a sweet, lingering fragrance that induces deep tranquility—a quality unmatched by agarwood from equatorial regions (such as Indonesia or Malaysia), which often carries a harsher, more pungent, or woody scent. Consequently, in both traditional Chinese medicine and India’s Ayurveda, agarwood from the Giao Chi/Champa region has long been classified as a premium-grade substance, often reserved for medicinal use by royalty.

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Trong lịch sử giao thương cổ đại và trung đại, trầm hương từ vùng đất Việt Nam ngày nay (bao gồm Giao Chỉ, Nhật Nam và đặc biệt là vương quốc Chăm Pa) được công nhận là loại trầm hương có chất lượng thượng hạng nhất thế giới, chiếm giữ vị trí độc tôn mà không một quốc gia nào khác có thể thay thế.
Sự đặc biệt này được minh chứng qua cả thư tịch cổ phương Đông lẫn phương Tây nhờ các yếu tố cốt lõi sau:
1. Bản đồ phân bố và tên gọi "Vương quốc trầm hương"
Trong khi các khu vực như Nam Ấn Độ, Sumatra hay Borneo cũng sản xuất trầm hương, thì dải đất miền Trung Việt Nam (lãnh thổ vương quốc Chăm Pa cổ đại, kéo dài từ Quảng Bình đến Bình Thuận, đặc biệt là vùng Khánh Hòa, Phú Yên) được mệnh danh là "thủ phủ" của loài cây cho trầm tốt nhất.