The Quadrant B6 of the Murillo Velarde 1734 map, which primarily depicts Northern and Central Luzon. 

Key Features of Quadrant B6

1. "Nueva Castilla o Luzon"

   • The map labels Luzon as "Nueva Castilla," reflecting Spanish colonial influence.

   • The Spanish often named territories after their homeland, and "Nueva Castilla" was a term used to reinforce their rule.

2. Geographical Coverage

   • Covers the northern and central regions of Luzon, including:

     • Ilocos region (coastal area on the left)

     • Cagayan Valley (upper part of the quadrant)

     • Pampanga, Bulacan, and Tarlac (lower portion)

3. Prominent Locations

   • Cagayan River: The largest river system in the Philippines, shown prominently on the map.

   • Pangasinan and Ilocos: Coastal settlements vital for trade and agriculture.

   • Baler and Infanta (eastern Luzon): Located along the Pacific coast, important for maritime activities.

   • Pampanga and Bulacan: Already thriving provinces during Spanish rule.

4. Spanish Roads and Routes

   • The map highlights Spanish-built roads and river routes, which were used for trade, administration, and missionary work.

   • The term "Camino" (road) is visible, indicating Spanish colonial roads connecting settlements.

5. Mountains and Rivers

   • Mountain ranges are represented with small triangular symbols, likely referring to the Cordillera mountain range.

   • The Río Grande de Cagayan (Cagayan River) is depicted, which was crucial for transportation and trade.

6. Maritime Features

   • Ships and sea routes are drawn, reinforcing the importance of maritime navigation.

    

Significance of the Quadrant

• Strategic Importance: This quadrant showcases how Northern and Central Luzon played a major role in trade, agriculture, and governance during the Spanish period.

• Trade and Colonial Control: The depiction of major rivers and coastal settlements reflects Spanish control over key economic hubs.

• Cultural Integration: The settlements listed were heavily influenced by Spanish missions, shaping local governance, economy, and religion.