ASP.Net Core: Update record using Entity Framework

Hi! Why my code note update existing data by id?

namespace HRD_Model.Models
{
    public class Region
    {
        [Key]
        public int Region_Id { get; set; }
        [Required]
        [MaxLength(25)]
        public string Region_Name { get; set;} = string.Empty;
    }
}

RegionController:

[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Update(Region region, int Id)
{
    var existingRegion = await _context.Regions.FirstOrDefaultAsync(e => e.Region_Id == Id);
    if (existingRegion == null)
    {
        return NotFound($"No region found with ID {region.Region_Id}");
    }

    try
    {
        _context.Entry(existingRegion).CurrentValues.SetValues(region);
        await _context.SaveChangesAsync();
        return RedirectToAction("Index");
    }
    catch (Exception ex)
    {
        return StatusCode(500, "An error occurred while updating the region. Details: " + ex.Message);
    }
}

View:

@{
    ViewData["Title"] = "Update";
}

<h1>Update</h1>
<div class="row">
    <div class="col-md-12">
        <form method="post" asp-action="Update">
            <input type="text" name="Id" value="@Model.Region_Id" />
            <div class="form-group">
                <label>Region Name</label>
                <input type="text" class="form-control" name="Region_Name" placeholder="last name" value="@Model.Region_Name" required>
            </div>
            <button class="btn btn-success" type="submit">Update Region</button>
        </form>
    </div>
</div>